tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Battery charger driver for TI's tps65090
3 *
4 * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
5
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18#include <linux/delay.h>
19#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/interrupt.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/of_device.h>
25#include <linux/platform_device.h>
26#include <linux/power_supply.h>
27#include <linux/slab.h>
28
29#include <linux/mfd/tps65090.h>
30
31#define TPS65090_REG_INTR_STS 0x00
32#define TPS65090_REG_INTR_MASK 0x02
33#define TPS65090_REG_CG_CTRL0 0x04
34#define TPS65090_REG_CG_CTRL1 0x05
35#define TPS65090_REG_CG_CTRL2 0x06
36#define TPS65090_REG_CG_CTRL3 0x07
37#define TPS65090_REG_CG_CTRL4 0x08
38#define TPS65090_REG_CG_CTRL5 0x09
39#define TPS65090_REG_CG_STATUS1 0x0a
40#define TPS65090_REG_CG_STATUS2 0x0b
41
42#define TPS65090_CHARGER_ENABLE BIT(0)
43#define TPS65090_VACG BIT(1)
44#define TPS65090_NOITERM BIT(5)
45
46struct tps65090_charger {
47 struct device *dev;
48 int ac_online;
49 int prev_ac_online;
50 int irq;
51 struct power_supply ac;
52 struct tps65090_platform_data *pdata;
53};
54
55static enum power_supply_property tps65090_ac_props[] = {
56 POWER_SUPPLY_PROP_ONLINE,
57};
58
59static int tps65090_low_chrg_current(struct tps65090_charger *charger)
60{
61 int ret;
62
63 ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
64 TPS65090_NOITERM);
65 if (ret < 0) {
66 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
67 __func__, TPS65090_REG_CG_CTRL5);
68 return ret;
69 }
70 return 0;
71}
72
73static int tps65090_enable_charging(struct tps65090_charger *charger)
74{
75 int ret;
76 uint8_t ctrl0 = 0;
77
78 ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
79 &ctrl0);
80 if (ret < 0) {
81 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
82 __func__, TPS65090_REG_CG_CTRL0);
83 return ret;
84 }
85
86 ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
87 (ctrl0 | TPS65090_CHARGER_ENABLE));
88 if (ret < 0) {
89 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
90 __func__, TPS65090_REG_CG_CTRL0);
91 return ret;
92 }
93 return 0;
94}
95
96static int tps65090_config_charger(struct tps65090_charger *charger)
97{
98 uint8_t intrmask = 0;
99 int ret;
100
101 if (charger->pdata->enable_low_current_chrg) {
102 ret = tps65090_low_chrg_current(charger);
103 if (ret < 0) {
104 dev_err(charger->dev,
105 "error configuring low charge current\n");
106 return ret;
107 }
108 }
109
110 /* Enable the VACG interrupt for AC power detect */
111 ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
112 &intrmask);
113 if (ret < 0) {
114 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
115 __func__, TPS65090_REG_INTR_MASK);
116 return ret;
117 }
118
119 ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
120 (intrmask | TPS65090_VACG));
121 if (ret < 0) {
122 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
123 __func__, TPS65090_REG_CG_CTRL0);
124 return ret;
125 }
126
127 return 0;
128}
129
130static int tps65090_ac_get_property(struct power_supply *psy,
131 enum power_supply_property psp,
132 union power_supply_propval *val)
133{
134 struct tps65090_charger *charger = container_of(psy,
135 struct tps65090_charger, ac);
136
137 if (psp == POWER_SUPPLY_PROP_ONLINE) {
138 val->intval = charger->ac_online;
139 charger->prev_ac_online = charger->ac_online;
140 return 0;
141 }
142 return -EINVAL;
143}
144
145static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
146{
147 struct tps65090_charger *charger = dev_id;
148 int ret;
149 uint8_t status1 = 0;
150 uint8_t intrsts = 0;
151
152 ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
153 &status1);
154 if (ret < 0) {
155 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
156 __func__, TPS65090_REG_CG_STATUS1);
157 return IRQ_HANDLED;
158 }
159 msleep(75);
160 ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
161 &intrsts);
162 if (ret < 0) {
163 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
164 __func__, TPS65090_REG_INTR_STS);
165 return IRQ_HANDLED;
166 }
167
168 if (intrsts & TPS65090_VACG) {
169 ret = tps65090_enable_charging(charger);
170 if (ret < 0)
171 return IRQ_HANDLED;
172 charger->ac_online = 1;
173 } else {
174 charger->ac_online = 0;
175 }
176
177 /* Clear interrupts. */
178 ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_STS, 0x00);
179 if (ret < 0) {
180 dev_err(charger->dev, "%s(): Error in writing reg 0x%x\n",
181 __func__, TPS65090_REG_INTR_STS);
182 }
183
184 if (charger->prev_ac_online != charger->ac_online)
185 power_supply_changed(&charger->ac);
186
187 return IRQ_HANDLED;
188}
189
190static struct tps65090_platform_data *
191 tps65090_parse_dt_charger_data(struct platform_device *pdev)
192{
193 struct tps65090_platform_data *pdata;
194 struct device_node *np = pdev->dev.of_node;
195 unsigned int prop;
196
197 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
198 if (!pdata) {
199 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
200 return NULL;
201 }
202
203 prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
204 pdata->enable_low_current_chrg = prop;
205
206 pdata->irq_base = -1;
207
208 return pdata;
209
210}
211
212static int tps65090_charger_probe(struct platform_device *pdev)
213{
214 struct tps65090_charger *cdata;
215 struct tps65090_platform_data *pdata;
216 uint8_t status1 = 0;
217 int ret;
218 int irq;
219
220 pdata = dev_get_platdata(pdev->dev.parent);
221
222 if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
223 pdata = tps65090_parse_dt_charger_data(pdev);
224
225 if (!pdata) {
226 dev_err(&pdev->dev, "%s():no platform data available\n",
227 __func__);
228 return -ENODEV;
229 }
230
231 cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
232 if (!cdata) {
233 dev_err(&pdev->dev, "failed to allocate memory status\n");
234 return -ENOMEM;
235 }
236
237 platform_set_drvdata(pdev, cdata);
238
239 cdata->dev = &pdev->dev;
240 cdata->pdata = pdata;
241
242 cdata->ac.name = "tps65090-ac";
243 cdata->ac.type = POWER_SUPPLY_TYPE_MAINS;
244 cdata->ac.get_property = tps65090_ac_get_property;
245 cdata->ac.properties = tps65090_ac_props;
246 cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props);
247 cdata->ac.supplied_to = pdata->supplied_to;
248 cdata->ac.num_supplicants = pdata->num_supplicants;
249 cdata->ac.of_node = pdev->dev.of_node;
250
251 ret = power_supply_register(&pdev->dev, &cdata->ac);
252 if (ret) {
253 dev_err(&pdev->dev, "failed: power supply register\n");
254 return ret;
255 }
256
257 irq = platform_get_irq(pdev, 0);
258 if (irq <= 0) {
259 dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
260 ret = irq;
261 goto fail_unregister_supply;
262 }
263
264 cdata->irq = irq;
265
266 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
267 tps65090_charger_isr, 0, "tps65090-charger", cdata);
268 if (ret) {
269 dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
270 ret);
271 goto fail_unregister_supply;
272 }
273
274 ret = tps65090_config_charger(cdata);
275 if (ret < 0) {
276 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
277 goto fail_unregister_supply;
278 }
279
280 /* Check for charger presence */
281 ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
282 &status1);
283 if (ret < 0) {
284 dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
285 TPS65090_REG_CG_STATUS1);
286 goto fail_unregister_supply;
287 }
288
289 if (status1 != 0) {
290 ret = tps65090_enable_charging(cdata);
291 if (ret < 0) {
292 dev_err(cdata->dev, "error enabling charger\n");
293 goto fail_unregister_supply;
294 }
295 cdata->ac_online = 1;
296 power_supply_changed(&cdata->ac);
297 }
298
299 return 0;
300
301fail_unregister_supply:
302 power_supply_unregister(&cdata->ac);
303
304 return ret;
305}
306
307static int tps65090_charger_remove(struct platform_device *pdev)
308{
309 struct tps65090_charger *cdata = platform_get_drvdata(pdev);
310
311 power_supply_unregister(&cdata->ac);
312
313 return 0;
314}
315
316static struct of_device_id of_tps65090_charger_match[] = {
317 { .compatible = "ti,tps65090-charger", },
318 { /* end */ }
319};
320
321static struct platform_driver tps65090_charger_driver = {
322 .driver = {
323 .name = "tps65090-charger",
324 .of_match_table = of_tps65090_charger_match,
325 .owner = THIS_MODULE,
326 },
327 .probe = tps65090_charger_probe,
328 .remove = tps65090_charger_remove,
329};
330module_platform_driver(tps65090_charger_driver);
331
332MODULE_LICENSE("GPL v2");
333MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
334MODULE_DESCRIPTION("tps65090 battery charger driver");